For example, if a support weighs 100 g, then 20 wt. Preferably, the olefinic naphtha feedstock contains about 10 to 30 wt. The naphtha feedstream is conducted into the reaction zone where it contacts a source of hot, regenerated catalyst. When steam is added to the preferred process, it may be added in an amount ranging from about 0 mol. endobj 3 0 obj mixt. Species of aluminum oxyhydroxides--alumina, boehmite, diaspore, and transitional aluminas such as -alumina, -alumina, -alumina, -alumina, -alumina, -alumina, and -alumina can be employed. The medium pore size zeolites generally have a pore size from about 0.5 nm, to about 0.7 nm and include for example, MFI, MFS, MEL, MTW, EUO, MTT, HEU, FER, and TON structure type zeolites (IUPAC Commission of Zeolite Nomenclature). . When the olefinic naphtha feed is obtained from processes such as catalytic cracking, steam cracking, or coking, then the first step may be referred to as re-cracking. In fact, many U.S. steam crackers are designed to run either feedstock. Get ideas for your own presentations. The steam may be added to the process for purposes such as stripping and it may naturally evolve from the process during, for example, catalyst regeneration. The second step comprises hydroprocessing at least a portion of the cracked product in one or more hydroprocessing reactions to provide a hydroprocessed cracked product having a reduced concentration of non-hydrocarbyl species but without a substantial octane reduction. % to about 30 wt. 1. of naphtha. In a preferred embodiment, steam is present in the reaction zone. See Breck. Steam cracking these hydrocarbons is accomplished by first mixing them with steam, then running them through tubes in a cracking furnace where the feedstock is briefly heated to very high temperatures. 1, pp. a$*5dqk. The unconverted cracked product was separated and then selectively hydroprocessed (Example #6) with the highly selective catalyst of Example #4 to achieve the same S level as in Example #4. However, such steam does not substantially affect the catalyst's activity for propylene yield. More preferred catalysts include those which are comprised of a molecular sieve having an average pore diameter less than about 0.7 nanometers (nm), the molecular sieve comprising from about 10 wt. In a preferred embodiment, the selective hydroprocessing catalyst may contain 0-5 wt. . %, preferably about 20 wt. %, of the total fluidized catalyst composition. The selective hydroprocessing catalyst when used in accordance with the selective hydroprocessing conditions set forth in this invention provides both high activity and selectivity for selective naphtha hydroprocessing. All of the above patents are incorporated herein by reference. For comparison, Example #3 was first converted in accordance with the cracking step of this invention, providing 40% conversion to products boiling below the naphtha boiling range (i.e., lighter products) and an increase of 0.2 octane (Example #5). Catal., vol. % of paraffins are converted to light olefins, and then. The naphtha may be a thermally cracked or a catalytically cracked naphtha. % to about 10 wt. By accepting, you agree to the updated privacy policy. % of a crystalline molecular sieve, based on the weight of the catalyst having an average pore diameter less than about 0.7 nm under catalytic conversions conditions in order to form a naphtha product, wherein the naphtha feedstock is a thermally or catalytically cracked naphtha having a boiling range of about 65 F. to about 430 F., and wherein the catalytic conversion conditions include a temperature ranging from about 500 C. to about 650 C., a hydrocarbon partial pressure ranging from about 10 to about 40 psia, a hydrocarbon residence time ranging from about 1 to about 10 seconds, and a catalyst to feed ratio, by weight, of about 3 to 12, wherein the naphtha feedstock contains about 5 wt. The present invention relates to a process for hydroprocessing a catalytically cracked or thermally cracked naphtha stream. The cracked feedstock is then rapidly quenched (cooled) to stop the hydrocarbon molecules from being completely consumed. Accordingly, at least about 60 wt. 4,254,297; titanium aluminophosphates (TAPO), such as TAPO-11 described in U.S. Pat. (b) contacting at least a portion of the naphtha product with a catalytically effective amount of a hydroprocessing catalyst under hydroprocessing conditions in order to form the hydroprocessed product. Learn new and interesting things. No. For example, these compounds are listed in the Periodic Table found at the last page of Advanced Inorganic Chemistry, 2nd Edition 1966, Interscience Publishers, by Cotton and Wilkinson. Enjoy access to millions of ebooks, audiobooks, magazines, and more from Scribd. The stripped catalyst is then passed to the regeneration zone where it is regenerated by burning coke on the catalyst in the presence of an oxygen containing gas, preferably air. Preferred Group VIII metals include Co, Ni, and Fe, with Co and Ni being most preferred. % of the amount of hydrocarbon feed. The most preferred is ZSM-5, which is described in U.S. Pat. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LADWIG, PAUL K.;BRIGNAC, GARLAND B.;STUNTZ, GORDON F.;AND OTHERS;REEL/FRAME:010592/0145;SIGNING DATES FROM 19991210 TO 19991221, Owner name: Download reference work entry PDF Introduction . 11. %PDF-1.6 endobj Preferably, the naphtha streams are derived from the fluid catalytic cracking of gas oils and resids. Good luck! Tap here to review the details. % to about 50 mol. EXXONMOBIL CHEMICAL PATENTS INC., TEXAS, Free format text: Any expansion joint must be installed in a properly anchored and guided piping system in order to perform as designed. The silica content of the silica-alumina support can be from 2-30 wt. %. Such naphthas are typically rich in olefins, diolefins, and mixtures thereof, and relatively lean in paraffins. The hydrogen treat rate is about 500 to 3000 scf/bbl and the preferred hydroprocessing catalyst is comprised of an alumina support with Co and Mo added to it. 6,069,287. Meyers et al., Journal of Catalysis, vol. Here you will find market insights, useful tools, and guidance to help you to succeed. Still not sure about the performance requirements of the intended application? % to about 30 wt. Preferred catalysts include OLEFINS MAX catalyst available from W. R. Grace and Co., Columbia, Md. AI and Machine Learning Demystified by Carol Smith at Midwest UX 2017, Pew Research Center's Internet & American Life Project, Harry Surden - Artificial Intelligence and Law Overview, No public clipboards found for this slide. This was accomplished at a lower hydroprocessing severity (3.71 vs. 3.27 LHSV) and with minimal octane loss (1.9 R+M/2). <>/XObject<>/ColorSpace<>>>/Annots[137 0 R 138 0 R 139 0 R 140 0 R 141 0 R 142 0 R 143 0 R 144 0 R 145 0 R 146 0 R 147 0 R 148 0 R 149 0 R 150 0 R 151 0 R 152 0 R 153 0 R 154 0 R 155 0 R 156 0 R 157 0 R 158 0 R 159 0 R 160 0 R 161 0 R 162 0 R 163 0 R 164 0 R 165 0 R 166 0 R 167 0 R 168 0 R 169 0 R 170 0 R 171 0 R 172 0 R 173 0 R 174 0 R]/Tabs/S/StructParents 4>> ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:EXXONMOBIL RESEARCH AND ENGINEERING COMPANY;REEL/FRAME:011851/0363, Free format text: %, preferably from about 20 wt. % steam means that no steam is added to the preferred process. Naphtha is primarily derived from crude oil, while ethane is more prevalent in natural gas and natural gas liquids (aka NGLs, a mixture of various hydrocarbons often co-produced along with natural gas). Naphtha cracking: new high-yield process - C&EN . Where selective hydroprocessing is employed, and especially where selective hydrodesulfurization is employed, a preferred hydroprocessing catalyst may contain 1-10 wt. Naphtha Cracking 5 6. % of the of the naphtha product, in the case of selective hydroprocessing under relatively mild conditions. The hydrogen containing gas is preferably added to establish a hydrogen charge rate ranging from about 500 to about 5,000 standard cubic feet per barrel (SCF/B), more preferably from about 1000 to about 3000 SCF/B. % of paraffins are converted to olefins. But the expansion joint must also be properly applied into a well-designed piping system, where pipe anchors and guides are used to control the stresses being applied to the expansion joint. In a preferred embodiment, the olefinic naphtha is reacted in a process unit comprised of a reaction zone, a stripping zone, and a catalyst regeneration zone. While it is preferred that the hydroprocessing step be practiced in connection with the preferred cracking step, feeds for the hydroprocessing step may include a cracked naphtha formed in a conventional naphtha cracking reaction. 1 downloads 41 Views 149KB Size. % to about 70 wt. structure is generally more complex. Expansion joint salespeople must not only be familiar with the products they supply, but also with how those products work along with the rest of the components in a properly designed piping system. The term on support means that the percents are based on the weight of the support. More particularly, the invention relates to a process for cracking an olefinic naphtha using a zeolite catalyst to form a cracked product having a diminished total olefin concentration, and then hydroprocessing at least a portion of the cracked product in a manner that reduces the sulfur concentration while substantially retaining the olefin content in order to maintain octane. Our analysis indicates that the ExxonMobil process achieves a $100-$200/ton cost advantage vis--vis naphtha cracking When steam is added in conventional processes, it may be present in amounts ranging from about 1 mol. Weve updated our privacy policy so that we are compliant with changing global privacy regulations and to provide you with insight into the limited ways in which we use your data. Assigned to EXXONMOBIL RESEARCH & ENGINEERING CO. Click here to review the details. % olefins, wherein no more than about 20 wt. % MoO. More preferably, such catalysts have a Steam Activation index ranging from 0.75 to about 1, and still more preferably ranging from about 0.8 to about 1, and even more preferably from 0.9 to about 1. PRESENTATION ON PLANT DESIGN FOR MANUFACTURING OF HYDROGEN, Petrochemicals students training seminar at jazan univ 12 feb 2019, BE Chemical Engineering Design Project Production Of Propylene Oxide, Naphtha Characterization and Hydrodesulfurization, Secure PIN Management How to Issue and Change PINs Securely over the Web, Basics of Coding in Pediatrics Medical Billing, Information frn Lkemedelsverket #5 2013, Lkemedelsverket (Medical Products Agency, Sweden), Naphtha Cracking Unit : Ethylene Production, IRJET- Power Scenario in India and the Need of Nuclear Power Generation, Current advancement in different gas liquid operations, Sustainable Development of the Textile Industry, Biomass, A Clean Energy for A Clean World- Farm2Energy, New Frontiers In EOR Methodologies By Application Of Enzymes, Graduation Presentation_CeylanpinarATAY_2, Exergy analysis - a tool for sustainable technology - in engineering education. 6 0 obj Butane, light naphtha, heavy naphtha, and . x+ | Pretreatment is optional in the preferred process because the preferred catalyst's activity and selectivity for propylene yield is substantially insensitive to the presence of steam. Hydrocracking Mohammed Ba-Shammakh Outline Introduction Hydrocracking Chemistry Hydrogen consumption Hydrocracking process Conclusion Introduction A . % olefins was hydroprocessed under selective hydroprocessing conditions with a highly selective catalyst containing 5.2 wt. Bridging the Gap Between Data Science & Engineer: Building High-Performance T How to Master Difficult Conversations at Work Leaders Guide, Be A Great Product Leader (Amplify, Oct 2019), Trillion Dollar Coach Book (Bill Campbell). f Latest Development in steam cracking. The high selectivity of the catalyst provides abated olefin hydrogenation at a given sulfur removal level as compared to conventional hydroprocessing catalysts. 7 0 obj Call us at 1-800-221-2319 or through our website at hosemaster.com today. Contact us today if we can help you to survey the piping layout. In another embodiment, the invention is a hydroprocessed product formed according to such a process.
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